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   <script>
       //检测数据类型
        // let s = Symbol()
        // console.log(typeof s)

        // let a = {a: 1}
        // let b = {b:1}
        // let c = {}
        // c[a] = 3
        // c[b] = 4 
        // console.log(c);

        // let s1 = Symbol('s')
        // let s2 = Symbol('s')
        // //控制台输出为false说明symbol函数参数只是对其的描述
        // console.log(s1 === s2)

        

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